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   tp_oninput() - notify on any input

   nNote := tp_oninput(nPort, [cFunction])

   nPort       Serial port number.
   cFunction   Name of notification function.

   Returns     Notification handle.

   Requests notification when any character is received by the serial
   port.  If cFunction is omitted, deletes any oninput notification
   request for that port.

   Example:

       tp_oninput(1, "GetData")